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Finding the Fourth Proportional to 28,001.60, 42,021.60 and 12,430.40

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Solution

The fourth proportional to 28,001.60, 42,021.60 and 12,430.40 is: 18,654.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,001.60 : 42,021.60 = 12,430.40 : x
  2. Step 2: Convert to fraction form
    28,001.60/42,021.60 = 12,430.40/x
  3. Step 3: Cross multiply
    28,001.60x = 42,021.60 × 12,430.40
  4. Step 4: Simplify right side
    28,001.60x = 522,345,296.64
  5. Step 5: Solve for x
    x = 522,345,296.64/28,001.60
  6. Step 6: Final answer
    x = 18,654.12

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.